Webboth mucinex d and mucinex dm contain the active ingredient guaifenesin, which is an expectorant that helps loosen and thin mucus in the airways, making it easier to cough. So, they’re both expectorants, or. It has two active ingredients:

Guaifenesin is an expectorant that helps. Mucinex d and mucinex dm both contain guaifenesin as an active ingredient. It has two active ingredients: Webdec 6, 2023 · mucinex d and mucinex dm both contain the expectorant guaifenesin (which is contained as a single ingredient in mucinex).